The Age of Departure
Overview
The Age of Departure encompasses the period during which humanity transitioned from maintaining isolated off-world settlements to supporting a permanent interplanetary civilization. Although humans had lived beyond Earth for generations before the era began, most earlier settlements depended heavily on terrestrial industry, food production, and technical support. By the end of the period, that dependence had largely disappeared.
The era is traditionally dated from the first generation of self-sustaining lunar and Martian settlements to the completion of the major asteroid extraction networks that supplied the inner Solar System.
Expansion Beyond Earth
Early expansion focused on locations with immediate economic value. Lunar settlements provided access to vacuum manufacturing and helium extraction, while Mars attracted long-term colonization efforts due to its accessible water reserves and potential for large-scale habitation.
The asteroid belt proved even more significant. Advances in autonomous mining, bulk-material processing, and orbital construction allowed settlements to export metals, volatiles, and manufactured components throughout the Solar System. Many institutions that would later become major political and economic powers began as mining cooperatives or transport syndicates operating in the Belt.
During this period, large rotating habitats also became practical. Early O'Neill cylinders and Stanford torus designs had existed for decades, but improvements in construction automation enabled settlements to build habitats at scales previously considered unrealistic. These communities gradually developed identities distinct from both Earth and planetary colonies.
The Transportation Network
The most important achievement of the era was not any single colony but the creation of reliable transportation infrastructure.
Permanent cycler routes connected Earth, Luna, Mars, and major asteroid settlements. Orbital fuel depots, maintenance stations, and logistics hubs reduced travel costs and increased traffic throughout the inner Solar System. Freight movement became predictable enough for complex interplanetary supply chains to emerge.
By the late Age of Departure, most citizens of the Solar System would never leave their home settlement, but they depended daily upon goods and materials that crossed millions of kilometers through these transportation networks.
Society and Governance
Most governments during the Age of Departure were extensions of terrestrial institutions. Earth-based nations, corporations, and international organizations sponsored many settlements and retained varying degrees of authority over them.
Over time, however, distance and local conditions encouraged political independence. Settlement councils, habitat administrations, and cooperative ownership models became increasingly common. Many later political traditions trace their origins to this period.
Biologically, humanity remained relatively unified. Genetic engineering was widely used in medicine, but modification remained focused on treating disease and preventing inherited disorders. Permanent population-scale adaptation had not yet become common practice.
Legacy
The Age of Departure established the infrastructure upon which every later era depended. The transportation corridors, industrial networks, habitat construction techniques, and settlement traditions developed during this period remained central features of Solar civilization for centuries.
Many of the Worlds and habitats that would later produce distinct Solseed populations were founded during the Age of Departure, but the inhabitants of the era generally still considered themselves members of a single human civilization rather than separate Clades.
